2009 Microchip Technology Inc.
Advance Information
DS41297F-page 1
PIC18F2XK20/4XK20
1.0
DEVICE OVERVIEW
This
document
includes
the
programming
specifications for the following devices:
PIC18F23K20
PIC18F24K20
PIC18F25K20
PIC18F26K20
PIC18F43K20
PIC18F44K20
PIC18F45K20
PIC18F46K20
2.0
PROGRAMMING OVERVIEW
The
PIC18F2XK20/4XK20
devices
can
be
pro-
grammed using either the high-voltage In-Circuit Serial
Programming (ICSP) method or the low-voltage
ICSP method. Both methods can be done with the
device in the users’ system. The low-voltage ICSP
method is slightly different than the high-voltage
method and these differences are noted where applica-
ble. This programming specification applies to the
PIC18F2XK20/4XK20 devices in all package types.
2.1
Hardware Requirements
In High-Voltage ICSP mode, the PIC18F2XK20/4XK20
devices require two programmable power supplies:
one for VDD and one for MCLR/VPP/RE3. Both supplies
should have a minimum resolution of 0.25V. Refer to
additional hardware parameters.
2.1.1
LOW-VOLTAGE ICSP
PROGRAMMING
In Low-Voltage ICSP mode, the PIC18F2XK20/4XK20
devices can be programmed using a single VDD source
in the operating range. The MCLR/VPP/RE3 does not
have to be brought to a different voltage, but can
instead be left at the normal operating voltage. Refer to
additional hardware parameters.
2.2
Pin Diagrams
The pin diagrams for the PIC18F2XK20/4XK20 family
are shown in Figure 2-3 and Figure 2-4.
TABLE 2-1:
PIN DESCRIPTIONS (DURING PROGRAMMING): PIC18F2XK20/4XK20
Pin Name
During Programming
Pin Name
Pin Type
Pin Description
MCLR/VPP/RE3
VPP
P
Programming Enable
VDD(2)
VDD
P
Power Supply
VSS(2)
VSS
PGround
RB5
PGM
I
Low-Voltage ICSP input when LVP Configuration bit equals ‘1’(1)
RB6
PGC
I
Serial Clock
RB7
PGD
I/O
Serial Data
Legend: I = Input, O = Output, P = Power
Note 1:
See Figure 5-1 for more information.
2:
All power supply (VDD) and ground (VSS) pins must be connected.
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